Global Patent Index - EP 1039485 A1

EP 1039485 A1 2000-09-27 - Porcelain insulator and method of manufacturing the same

Title (en)

Porcelain insulator and method of manufacturing the same

Title (de)

Porzellanisolator und Verfahren zu seiner Herstellung

Title (fr)

Isolateur en porcelaine et méthode de sa fabrication

Publication

EP 1039485 A1 (EN)

Application

EP 00106315 A

Priority

JP 7883799 A

Abstract (en)

A porcelain insulator including a porcelain insulator main body and a coating layer formed on a surface of the porcelain insulator main body, the coating layer being made of porcelain raw materials including mainly materials of high dielectric constant and having a relative dielectric constant larger than 4, wherein a ration between maximum value and minimum value of relative dielectric constants at micro portions in the coating layer along a thickness direction of the coating layer is smaller than 2. The porcelain insulator mentioned above can be manufactured by the steps of; (1) preparing said porcelain insulator main body; (2) preparing coating materials as a slurry by (a) grinding raw materials and mixing a clay therein to prepare porcelain raw materials made of 50-60 wt% of SiO2, 20-30 wt% of Al2O3 and a remainder of MgO, CaO, K2O, Na2O, (b) preparing materials of high dielectric constant having a relative dielectric constant larger than 10 separately; and (c) mixing 100 parts by weight of the thus prepared porcelain raw materials and 3-10 parts by weight of the thus prepared materials of high dielectric constant; (3) applying the thus prepared coating materials on a surface of the porcelain main body; and (4) firing the porcelain main body in which the coating materials are applied on its surface. <IMAGE>

IPC 1-7 (main, further and additional classification)

H01B 19/04; H01B 17/50

IPC 8 full level (invention and additional information)

H01B 17/50 (2006.01); C04B 41/50 (2006.01); C04B 41/87 (2006.01); H01B 19/00 (2006.01); H01B 19/04 (2006.01)

CPC (invention and additional information)

C04B 41/009 (2013.01); C04B 41/5038 (2013.01); C04B 41/87 (2013.01); H01B 19/04 (2013.01)

Combination set (CPC)

  1. C04B 41/5038 + C04B 41/4539 + C04B 41/5041
  2. C04B 41/009 + C04B 33/26

Citation (search report)

  • [A] DE 2633289 A1 19770518 - NIPPON GAISHA K K
  • [A] DATABASE WPI Section Ch Week 199236, Derwent Publications Ltd., London, GB; Class L03, AN 1992-298501, XP002138949

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1039485 A1 20000927; EP 1039485 B1 20040811; CN 1181501 C 20041222; CN 1268754 A 20001004; DE 60012805 D1 20040916; DE 60012805 T2 20050818; JP 2000276959 A 20001006; JP 3386739 B2 20030317

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